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Wed Jan 17 11:15:25 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027522.html

Hi M?ns,

On Wed, 2007-01-17 at 11:12 +0100, Panagiotis Issaris wrote:
> On Wed, 2007-01-17 at 10:09 +0000, M?ns Rullg?rd wrote:
> > Panagiotis Issaris said:
> > > On Wed, 2007-01-17 at 10:40 +0100, Panagiotis Issaris wrote:
> > >> Attached are two trivial patches with different approaches to prevent
> > >> the segfault as demonstrated by lol-ffplay.ogm.
> > >
> > > And I just noted they also prevent the segfault triggered by:
> > >
> > > takis at issaris:/usr/local/src/ffmpeg$ ./ffmpeg -i
> > > lol-ffplay.ogg /tmp/test.mpg
> > > FFmpeg version SVN-r7559, Copyright (c) 2000-2006 Fabrice Bellard, et al.
> > >   configuration:  --enable-gpl --enable-mp3lame --enable-faac --enable-x11grab
> > >   libavutil version: 49.1.0
> > >   libavcodec version: 51.28.0
> > >   libavformat version: 51.7.0
> > >   built on Jan 17 2007 10:41:27, gcc: 4.1.2 20060928 (prerelease) (Ubuntu
> > 4.1.1-13ubuntu5)
> > > [ogg @ 0x8444654]10 bytes of comment header remain
> > > [ogg @ 0x8444654]truncated comment header, 1 comments not found
> > > [ogg @ 0x8444654]Could not find codec parameters (Video: 0x0000)
> > > [ogg @ 0x8444654]Could not find codec parameters (Video: 0x0000)
> > >
> > > Seems stream 2 codec frame rate differs from container frame rate: inf (1/0) ->
> > 1000000.00 (1000000/1)
> > > Input #0, ogg, from 'lol-ffplay.ogg':
> > >   Duration: 00:00:00.2, start: 0.000000, bitrate: 548 kb/s
> > >   Stream #0.0: Audio: vorbis, 22050 Hz, mono, 548 kb/s
> > >   Stream #0.1: Video: 0x0000, 1000000.00 fps(r)
> > >   Stream #0.2: Video: 0x0000, 1000000.00 fps(r)
> > > picture size invalid (0x0)
> > > Segmentation fault (core dumped)
> > 
> > What platform are you on?  I don't get any crashes from that file, or the ogm
> > file on x86_64 (after fixing ogg2.c).
> x86, 32-bit, using Ubuntu Edgy.

GDB's output

takis at issaris:/usr/local/src/ffmpeg$ gdb ./ffmpeg_g 
GNU gdb 6.4.90-debian
[...]
(gdb) r  -y -i lol-ffplay.ogm /tmp/bla.avi
Starting program: /usr/local/src/ffmpeg/ffmpeg_g -y -i
lol-ffplay.ogm /tmp/bla.avi
FFmpeg version SVN-r7559, Copyright (c) 2000-2006 Fabrice Bellard, et
al.
[...]
picture size invalid (0x0)

Program received signal SIGSEGV, Segmentation fault.
sws_freeContext (ctx=0x0) at imgresample.c:675
675         if ((ctx->resampling_ctx->iwidth !=
ctx->resampling_ctx->owidth) ||
(gdb) bt
#0  sws_freeContext (ctx=0x0) at imgresample.c:675
#1  0x0805f056 in main (argc=Cannot access memory at address 0x1
) at ffmpeg.c:2015
(gdb) 

With friendly regards,
Takis

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Showing content from https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027522.html below:

[Ffmpeg-devel] [PATCH] Fix for the lol-ffplay.ogm testcase